Roll on a few months and the guardian of climate scientists, banshee of warming disasters had this to say about the construction of a vast oil pipeline through Canada and the US.

“I’ve been on record supporting Keystone XL… we know we can get our resources to market more safely and responsibly while meeting our climate change goals.”

Keystone XL, it is estimated, would carry 800,000 barrels of tar sands oil every day over nearly 900 miles. It’s dirty stuff, by anyone’s reckoning. Each barrel would have a carbon footprint 17% higher than conventional oil, said the State Department.

Truly, you might say, Trudeau is a man for all seasons, presidents and energy mixes. Usually the last one that he happens to spot.